Derivative Instruments at Gross Fair Value (Detail) - Level 2 - USD ($) $ in Millions		Mar. 26, 2016	Sep. 26, 2015
Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	$ 633	$ 1,551
Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	1,276	999
Interest rate contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	557	394
Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	36	13
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	564	1,442
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	1,033	905
Derivatives Designated as Hedging Instruments | Interest rate contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	557	394
Derivatives Designated as Hedging Instruments | Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	36	13
Not Designated as Hedging Instrument | Foreign exchange contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	69	109
Not Designated as Hedging Instrument | Foreign exchange contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	243	94
Not Designated as Hedging Instrument | Interest rate contracts | Other Current Assets
Derivative assets:
Fair Value of Derivative Assets	[1]	0	0
Not Designated as Hedging Instrument | Interest rate contracts | Accrued expenses
Derivative liabilities:
Fair Value of Derivative Liabilities	[2]	$ 0	$ 0

[1] The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets in the Condensed Consolidated Balance Sheets.

[2] The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as accrued expenses in the Condensed Consolidated Balance Sheets.